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I have done some research about the subject but I can't find the difference between Temperature Element (TE) and Temperature Indicator (TI) enter image description here

Here is an image of the P&ID of the project am working on if it can help clarify my question.

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  • $\begingroup$ ...and what have you found in your research? $\endgroup$ – L Selter Jan 29 '18 at 15:59
  • $\begingroup$ that is they are both instrument of temperature measurement, but i dont know what is the key difference $\endgroup$ – Azed S Jan 29 '18 at 16:01
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The element does the measuring and the indicator shows the value.

If you think of a simple thermometer, the bulb at the bottom measures the temperature and the glass tube indicates the value...

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  • $\begingroup$ well in the exampl that i have, there is a TE with TW ( thermowell ) and the TI is also accompanied with a TW even thou he only indicate the value ? $\endgroup$ – Azed S Jan 29 '18 at 16:12
  • $\begingroup$ @AzedS The TI (or the reference/cold junction) needs to be at a known temperature in order to solve the simple linear equations that Seebeck effects demand. An easy way to keep something at a known temperature is to place it in a bath of liquid/use a triple point of water cell or a thermowell. You can also use cold junction compensation, though and even some NMI labs use this. $\endgroup$ – lmsavk Jan 30 '18 at 1:34
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Temperature indicator consists of two parts: the first part is the temperature element itself and the second part is the electronic part that conditions the signal and convert it to 4 to 20 and then send it to control system .

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